Supercharged LT4 6.2L V8 Engine with 10L90 10-Speed Automatic Transmission

What This Powertrain Is

The Supercharged LT4 with the 10L90 10-speed transmission is a factory-style high-performance GM powertrain built for extreme street and performance applications. This setup delivers supercar-level power while maintaining modern drivability, making it ideal for muscle cars, restomods, and high-end engine swap projects.

Engine Overview

The LT4 is a 6.2 liter Gen V small-block V8 featuring direct injection and a factory supercharger. It uses advanced materials and modern GM engineering to support high horsepower in a compact, lightweight design.

Key engine features include:

• 6.2 liter displacement or 376 cubic inches

• Gen V small-block architecture

• Aluminum block and aluminum cylinder heads

• Longitudinal engine orientation for rear-wheel-drive platforms

Supercharged Performance

This engine produces approximately 650 horsepower with strong, immediate torque. The factory supercharger delivers instant throttle response and consistent power throughout the RPM range. Power comes on smoothly, making the engine manageable on the street while still delivering aggressive acceleration when demanded.

Strong Internal Components

The LT4 is built with heavy-duty internal components designed to handle supercharged output.

Internal highlights include:

• Forged steel crankshaft

• High-strength connecting rods

• Forged aluminum pistons

• Reinforced aluminum block design

These components ensure durability under high boost and high RPM operation.

Direct Injection and Valvetrain

Direct fuel injection improves combustion efficiency, throttle response, and power consistency. The pushrod valvetrain with two valves per cylinder keeps the engine compact while supporting high performance and reliability.

Premium gasoline is recommended to support the supercharged configuration and maintain optimal performance.

10L90 10-Speed Automatic Transmission

The 10L90 is a high-performance 10-speed automatic transmission designed to handle the torque output of the LT4. Closely spaced gear ratios keep the engine in its optimal power band, improving acceleration and responsiveness.

Transmission benefits include:

• High torque capacity

• Fast and precise shifts

• Improved launch and mid-range acceleration

• Lower cruising RPM for comfortable highway driving

Ideal Applications

This powertrain is well suited for:

• High-performance muscle cars

• Restomod builds

• Street and track-focused vehicles

• Performance trucks and SUVs

• Premium engine swap projects

Why Choose the LT4 and 10L90 Combo

The Supercharged LT4 with the 10L90 transmission delivers factory-engineered reliability, massive horsepower, and advanced transmission technology in one complete package. It is an ideal choice for builders seeking modern GM performance with proven durability and street-ready drivability.